Siemens 3AH3 Instruction Manual page 34

34
Check of the wiring and terminals
1. Physically check all of the circuit breaker
wiring for evidence of abrasion, cuts,
burning or mechanical damage.
2. Check all terminals to be certain they are
solidly attached to their respective
device.
Automatic spring-charging check (control
power required)
Repeat the automatic spring-charging check
described in the section describing the
installation check and initial functional tests
(refer to pages 9-10).
Primary tasks of this check are:
1. The circuit breaker must be energized
with control power for this check.
2. Energize the control-power source.
3. When control power is connected to the
circuit breaker, the closing spring should
automatically charge. Visually verify that
the closing spring is charged.
Note: A temporary source of control power
and test leads may be required if the
control-power source has not been
connected to the switchgear or circuit
breaker. When control power is connected
to the circuit breaker, the closing spring
should automatically charge.
Hazardous voltage and high-speed moving parts.
Will cause death, serious injury and property damage.
De-energize before working on this equipment.
Read instruction manuals, observe safety instructions and use qualified
personnel.
Electrical close and trip check (control
power required)
A check of the circuit breaker control circuits
shall be performed. This check is made with
the circuit breaker energized by control
power either from the switchgear or an
external control-power source.
1. Once the circuit breaker springs are
charged, move the switchgear-mounted
Close/Trip switch to the Close position.
Verify by both the sound of the circuit
breaker closing and by the main contact
status indicator that the circuit breaker
contacts are CLOSED.
2. As soon as the circuit breaker has closed,
the automatic spring-charging process is
repeated.
3. After a satisfactory close operation is
verified, move the switchgear-mounted
Close/Trip switch to the Trip position.
Verify by both the sound of the circuit
breaker opening and by the main
contact status indicator that the circuit
breaker contacts are OPEN.
4. After a satisfactory open operation is
verified, hold the circuit breaker manual
Trip button and apply and maintain an
electrical close signal. The circuit breaker
should close, immediately trip, the close
spring should charge, and the circuit
breaker should not attempt to close
again.
Completion of these checks demonstrates
satisfactory operation of auxiliary switches,
internal relays and open and close coils.